3000mA definitely correct .
2A (2000mA) used to be the standard for older models (probably lower with some of them)
2.5A (2500mA), 3A (3000mA) and even 4A (can you guess how many mA
?) power supplies are now used (higher power requirement for the device itself, and if you have a 2.5" internal bay, non-SSD drives can demand extra juice from the PSU).
I've got one power supply spliced up here to check current consumption for different devices and hard drives.